Direct power generation from waste coffee grounds in a biomass fuel cell

Jang, Hansaem; Ocon, Joey D.; Lee, Seunghwa; Lee, Jae Kwang; Lee, Jae-Young

doi:10.1016/j.jpowsour.2015.07.059

Cited by 57 publications

(45 citation statements)

References 36 publications

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“…However, as already mentioned above, it remains unclear, to a certain extent, which carbon properties lead to the maximum overall efficiency and the reasons behind this. Possible fuels include coal, coke, tar, and even organic waste [6,7,8], but it has been reported that the carbon quality and certain carbon structures are fundamentally important for good long term cell performances and high power densities [9,10]. Some of the required properties are [10]:submicron size carbon particlescrystallographic structure of the carbon latticeelectric conductivity (EC)high specific surface area (SSA)no or low content of impurities (e.g., inorganic matter)/high C content…”

Section: Introductionmentioning

confidence: 99%

Conductive Carbon Materials from the Hydrothermal Carbonization of Vineyard Residues for the Application in Electrochemical Double-Layer Capacitors (EDLCs) and Direct Carbon Fuel Cells (DCFCs)

et al. 2019

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This study investigates the production of bio-based carbon materials for energy storage and conversion devices based on two different vineyard residues (pruning, pomace) and cellulose as a model biomass. Three different char categories were produced via pyrolysis at 900 °C for 2 h (biochars, BC), hydrothermal carbonization (HTC) (at 220, 240 or 260 °C) with different reaction times (60, 120 or 300 min) (hydrochars, HC), or HTC plus pyrolysis (pyrolyzed hydrochars, PHC). Physicochemical, structural, and electrical properties of the chars were assessed by elemental and proximate analysis, gas adsorption surface analysis with N2 and CO2, compression ratio, bulk density, and electrical conductivity (EC) measurements. Thermogravimetric analysis allowed conclusions to be made about the thermochemical conversion processes. Taking into consideration the required material properties for the application in electrochemical double-layer capacitors (EDLC) or in a direct carbon fuel cell (DCFC), the suitability of the obtained materials for each application is discussed. Promising materials with surface areas up to 711 m2 g−1 and presence of microporosity have been produced. It is shown that HTC plus pyrolysis from cellulose and pruning leads to better properties regarding aromatic carbon structures, carbon content (>90 wt.%), EC (up to 179 S m−1), and porosity compared to one-step treatments, resulting in suitable materials for an EDLC application. The one-step pyrolysis process and the resulting chars with lower carbon contents and low EC values between 51 and 56 S m−1 are preferred for DCFC applications. To conclude, biomass potentials can be exploited by producing tailored biomass-derived carbon materials via different carbonization processes for a wide range of applications in the field of energy storage and conversion.

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Section: Introductionmentioning

confidence: 99%

Conductive Carbon Materials from the Hydrothermal Carbonization of Vineyard Residues for the Application in Electrochemical Double-Layer Capacitors (EDLCs) and Direct Carbon Fuel Cells (DCFCs)

et al. 2019

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“…O café é uma das bebidas mais populares e consumidas no mundo e o aumento na taxa de consumo continua a crescer aproximadamente 2,4% por ano, atingindo 9 milhões de toneladas em 2014 [12][13][14][15] . Neste contexto, a geração de resíduos provenientes do processamento de café é estimado em 8 milhões de toneladas por ano e grande parte é descartada, contando apenas com algumas aplicações, como por exemplo em queimadores para co-geração de energia e cultivo de cogumelos 13 .…”

Section: Ntroduçãounclassified

Biomassas brasileiras aplicadas à remoção de urânio de drenagem ácida de minas por processos de biossorção

Boniolo

Yabuki

Mortari

et al. 2017

RHE

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Resumo: Este trabalho teve como objetivo avaliar a redução da concentração de urânio em área de drenagem ácida de mina. O Brasil possui a sexta maior reserva de urânio do mundo e há grande quantidade de rejeitos acumulados contendo íons metálicos, semimetálicos e radiotóxicos. O método utilizado neste estudo para remover urânio foi a biossorção mediante a aplicação de biomassas brasileiras. Os efluentes aplicados foram coletados na mina Osamu Utsumi, que pertence às Indústrias Nucleares do Brasil e os biossorventes empregados nos ensaios foram cascas de banana, semente de moringa e borra de café. A decomposição térmica, a porosimetria de adsorção de nitrogênio e a microscopia eletrônica de varredura (MEV) foram realizadas para caracterizar fisicamente os biossorventes. A partir dos resultados obtidos, observou-se que os biossorventes com maior área de superfície e maior volume de poros resultaram em maiores valores de eficiência de remoção, com uma ordem crescente desses parâmetros: cascas de banana < borra de café < sementes de moringa. Considerando as amostras de efluentes com concentração de urânio de 6 mg L -1 , as sementes de moringa apresentaram remoção de aproximadamente 87%, enquanto a borra de café e cascas de banana apresentaram remoção de 74 e 56%, respectivamente.Palavras-chave: Adsorção de urânio. Drenagem ácida de mina. Casca de banana. Semente de moringa. Borra de café.Abstract: This work aimed to evaluate the uranium concentration reduction in acid mine drainage. Brazil owns the sixth biggest uranium reserve in the world and there is large amount of accumulated tailings containing metallic, semi-metallic and radiotoxic ions. The method used in this study to remove uranium was biosorption by applying Brazilian biomass. The applied effluents were collected at the Osamu Utsaumi mine, which belongs to Industries Nucleares of Brazil and the biosorbents used in the tests were banana peel, moringa seed and spent coffee ground. Thermal decomposition, nitrogen adsorption porosimetry and scanning electron microscopy (SEM) were performed in order to characterize the biosorbents physically. From the results, it was observed that the biosorbents with a higher surface area and higher pore volume resulted in higher removal efficiency values, with an ascending order of these parameters: banana peels

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“…In this study PEM 1 fuel cells have been investigated. PEM fuel cell's Components such as MEA, GDL 2 and bipolar plate should be put together with the proper contact pressure from end plates to avoid the leakage and also to minimize the contact resistance of the cells [4][5][6]. Many studies have been done in the area of investigation of fuel cell's end plates and it's components to optimize efficiency.…”

Section: Introductionmentioning

confidence: 99%

Optimization of proton exchange membrane fuel cell’s end plates

2020

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In this study, we present the optimization of end plates to produce uniform pressure and low content on the gas diffusion layer in polymer membrane fuel cell. For this purpose the end plates and the influence of parameters on the gas diffusion layer pressure has been investigated. Parameters studied are the thickness of the end plate, the depth of the bipolar plates groove and the clamping pressure applied to the end plates. After defining their values in the Abaqus finite element software, mechanical analysis has been carried out to examine the stress distribution on the gas diffusion layer and the results have been extracted. By extracting the results of the analysis and importing into the Adaptive Network-based Fuzzy Inference Systems in MATLAB software, a numerical relationship between the influential values and the outputs is extracted. By investigating these relationships and defining the objective function, we investigate the algorithm required for the equation and uniformity of stress distribution on the gas diffusion layer. In this research, the bee algorithm has been used and it has been evaluating the effective parameters of the optimum fuel cell state. After final review of the results, the suggested optimum state of the bee algorithm is the thickness of the end plate 12 mm, the depth of the bipolar plate groove is 0.1077 mm and the clamping pressure is 11.0199 MPa.

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Direct power generation from waste coffee grounds in a biomass fuel cell

Cited by 57 publications

References 36 publications

Conductive Carbon Materials from the Hydrothermal Carbonization of Vineyard Residues for the Application in Electrochemical Double-Layer Capacitors (EDLCs) and Direct Carbon Fuel Cells (DCFCs)

Conductive Carbon Materials from the Hydrothermal Carbonization of Vineyard Residues for the Application in Electrochemical Double-Layer Capacitors (EDLCs) and Direct Carbon Fuel Cells (DCFCs)

Biomassas brasileiras aplicadas à remoção de urânio de drenagem ácida de minas por processos de biossorção

Optimization of proton exchange membrane fuel cell’s end plates

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